613a.cpp

C++实训教程

/*
	613a.CPP
	demo 继承的constructors
	Written by Feng
*/
#include <iostream.h>
class B
{
	protected:   int b1,b2;
	public:
      B():b1(0),b2(0){}
		B (int x,int y=100):b1(y),b2(x){}
		void Disp()
	   {cout << "  b1=" <<b1<<"  b2="<<b2<<endl;}
};

class D : public B
{
   private:  int d0;
	protected:   int d1;
	public:
		D (int x,int y):d1(y*10),B(x+d1),d0(d1*2){ } //or   :B(x), d1(y)
		D (int x):d0(x++),B(++x),d1(x+d0){ }
       void Disp()
	   {cout << "  b1=" <<b1<<"  b2="<< b2
      	<< "  d0=" << d0 << "  d1="<<d1<<endl;}

};
main(void)
{
	D x(1000,11); x.Disp();
	D y(222);  y.Disp();
	return 0;
}
/*  x(1000,11)
  b1=100  b2=1002  d0=4  d1=110
  b1=100  b2=223  d0=223  d1=447

*/ //step over of d1 766,110,100,1383 (d0,d1,b1,b2)

/*  x(1,11)
  b1=100  b2=3  d0=4  d1=110
  b1=100  b2=223  d0=223  d1=447

*/